Recently, Laferrère et al (16) compared the late (1 month) effect of an equivalent weight loss by RYGB or by diet in two groups of matched morbidly obese patients with type 2 diabetes mellitus. The glucose area under-the-curve (AUC) after an oral glucose tolerance test (OGTT) and glucose levels at 120' were significantly lower after RYGB compared with diet (P = 0.014 and P = 0.001, respectively).